<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(item,index) in list" :key="index">
            <td>{{item.id}}</td>
            <td>{{item.name}}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{red:item.price>100}">{{item.price}}</td>
            <td>{{momentDay(item.time)}}</td>
            <td><a @click="delBtn(item.id)" href="#" >删除</a></td>
          </tr>
          <tr>
            <td colspan="2">统计</td>
            <td colspan="2">总价值为:{{sumPrice}}</td>
            <td colspan="2">平均价:{{avePrice}}</td>
          </tr>
        </tbody>
          
        <tfoot v-if="list.length==0">
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
           
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input v-model.trim="name" type="text" class="form-control" placeholder="资产名称">
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input v-model.number="price" type="text" class="form-control" placeholder="价格">
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button @click.prevent="addBtn" class="btn btn-primary">添加资产</button>
      </form>
    </div>
  </div>
</template>
<script>
import moment from "moment"
export default {
  data() {
    return {
      name: "", // 名称
      price: 0, // 价格
      list: JSON.parse(localStorage.getItem('list')||'[]')
    };
  },
  computed: {
    sumPrice(){
      return this.list.reduce((sum,ele)=>sum+=ele.price,0)
    },
    avePrice(){
     return (this.sumPrice/this.list.length).toFixed(2)
    }
  },
  methods: {
    momentDay(val){
      return  moment(val).format('YYYY-MM-DD')
    },
    addBtn(){
      if(this.name==''||this.price==0){
      return alert('价格和资产不能为空')
      }
      let id=this.list.length>0?this.list[this.list.length-1].id+1:100
      this.list.push({id,name:this.name,price:this.price,time:new Date()})
      this.name=''
      this.price=0
      localStorage.setItem('list', JSON.stringify(this.list))
    },
    delBtn(i){
     this.list=this.list.filter(ele=>{return ele.id!=i})
    }
  }

};
</script>

<style >
.red{
  color: red;
}
</style>